Let G be a reductive Lie group,
Γ a nonuniform lattice in G. Let χ be a finite dimensional unitary representation of
Γ. In order to have Eisenstein series, (G,Γ) must satisfy a certain assumption. The
purpose of this note is to compute the Selberg trace formula for pairs (G,Γ) that do
not possess Eisenstein series. A necessary preliminary to this, is a trace formula for
IndΓG(χ). This is also presented.